Murata Mfg. Co., Ltd. v. Bel Fuse, Inc., No. 03 C 2934, Slip Op. (N.D. Ill. Mar. 5, 2008) (Gottschall, J.).*

Judge Gottschall granted plaintiffs’ motion to strike defendants’ allegedly new reverse doctrine of equivalents non-infringement argument, which defendants withdrew in response to plaintiffs’ motion. But the Court denied the motion as to all other allegedly new arguments and as to defendants’ supporting affidavits. The Court held that defendants’ non-infringement arguments were sufficiently set out in their timely expert reports.

The Court also held that defendants’ expert affidavits, submitted with their summary judgment response briefs, were proper. Fed. R. Civ. P. 56(e) specifically permits use of affidavits as support for summary judgment arguments. And defendants’ expert affidavits met the requirements for expert affidavits:

• The experts supported their conclusions by showing their reasoning; and
• The methodology met Daubert standards.

Finally, it did not matter that discovery was closed and that plaintiffs, therefore, would not be able to test the affidavits in a deposition. Plaintiffs cited no authority for the proposition that post-discovery affidavits were not permitted.

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